diff --git a/src/dnode/src/dnodeWrite.c b/src/dnode/src/dnodeWrite.c
index 2348cf62a4..aee14ed484 100644
--- a/src/dnode/src/dnodeWrite.c
+++ b/src/dnode/src/dnodeWrite.c
@@ -40,7 +40,7 @@ typedef struct {
   SRpcMsg  rpcMsg;
 } SWriteMsg;
 
-typedef struct _thread_obj {
+typedef struct _wworker_pool {
   int32_t        max;        // max number of workers
   int32_t        nextId;     // from 0 to max-1, cyclic
   SWriteWorker  *writeWorker;
diff --git a/src/util/src/tqueue.c b/src/util/src/tqueue.c
index 6d75776ac8..2cf94267f8 100644
--- a/src/util/src/tqueue.c
+++ b/src/util/src/tqueue.c
@@ -92,7 +92,7 @@ void *taosAllocateQitem(int size) {
 void taosFreeQitem(void *param) {
   if (param == NULL) return;
 
-  //pTrace("item:%p is freed", param);
+  pTrace("item:%p is freed", param);
 
   char *temp = (char *)param;
   temp -= sizeof(STaosQnode);
@@ -117,7 +117,7 @@ int taosWriteQitem(taos_queue param, int type, void *item) {
   queue->numOfItems++;
   if (queue->qset) atomic_add_fetch_32(&queue->qset->numOfItems, 1);
 
-  //pTrace("item:%p is put into queue, type:%d items:%d", item, type, queue->numOfItems);
+  pTrace("item:%p is put into queue, type:%d items:%d", item, type, queue->numOfItems);
 
   pthread_mutex_unlock(&queue->mutex);
 
@@ -197,7 +197,7 @@ int taosGetQitem(taos_qall param, int *type, void **pitem) {
     *pitem = pNode->item;
     *type = pNode->type;
     num = 1;
-    // pTrace("item:%p is fetched, type:%d", *pitem, *type);
+    pTrace("item:%p is fetched, type:%d", *pitem, *type);
   }
 
   return num;
diff --git a/src/vnode/main/src/vnodeMain.c b/src/vnode/main/src/vnodeMain.c
index be41b6b7c1..5bb5ef55ef 100644
--- a/src/vnode/main/src/vnodeMain.c
+++ b/src/vnode/main/src/vnodeMain.c
@@ -165,7 +165,10 @@ void vnodeRelease(void *pVnodeRaw) {
 
   int32_t refCount = atomic_sub_fetch_32(&pVnode->refCount, 1);
 
-  if (refCount > 0) return;
+  if (refCount > 0) {
+    dTrace("pVnode:%p vgId:%d, release vnode, refCount:%d", pVnode, pVnode->vgId, refCount);
+    return;
+  }
 
   // remove read queue
   dnodeFreeRqueue(pVnode->rqueue);
diff --git a/src/vnode/main/src/vnodeWrite.c b/src/vnode/main/src/vnodeWrite.c
index 2c31f2243b..c6699bd62c 100644
--- a/src/vnode/main/src/vnodeWrite.c
+++ b/src/vnode/main/src/vnodeWrite.c
@@ -255,7 +255,8 @@ int vnodeWriteToQueue(void *param, SWalHead *pHead, int type) {
   SWalHead *pWal = (SWalHead *)taosAllocateQitem(size);
   memcpy(pWal, pHead, size);
 
-  taosWriteQitem(pVnode->wqueue, type, pHead);
+  atomic_add_fetch_32(&pVnode->refCount, 1);
+  taosWriteQitem(pVnode->wqueue, type, pWal);
 
   return 0;
 }
diff --git a/src/vnode/wal/src/walMain.c b/src/vnode/wal/src/walMain.c
index e192e91e8a..9708b0d9dc 100644
--- a/src/vnode/wal/src/walMain.c
+++ b/src/vnode/wal/src/walMain.c
@@ -287,6 +287,8 @@ static int walRestoreWalFile(char *name, void *pVnode, int (*writeFp)(void *, SW
     (*writeFp)(pVnode, pHead, TAOS_QTYPE_WAL);
   }
 
+  free(buffer);
+
   return code;
 }